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please help where is it?
You get it from Father Drazhen in the monastery if you accept his quest.
Talk to Josef there. The boy may have stolen it. : )
If I remember correctly, key is hidden very close in that same area. Keep trying to find it...
I was confused about which key you needed. There are two keys.
One Father Drazhen gives you if you accept his quest to weed his garden. That's the one you seem to be missing. But you only get that from Father Drazhen if you accept his quest to weed his garden. This is what he says, "You're so kind to poor, old Father Drazhen. Take the key to the garden."
The other key you get if you talk to the boy Josef in the monastery about a crypt, he tells you, "I've got nightmares from exploring that creepy place myself. I'm sorry to say I stole Father Drazhen's key to the crypt. I'm really sorry I ever went down there. Good thing I can run fast. Take the key and see for yourself." He gives you the key to the crypt.
If you don't have either of those keys now, maybe you used them and have some kind of glitch. It's not necessary to finishing the game.
Once you use a key, it usually disappears from your inventory.