Small key appears in both The Witcher 3: Wild Hunt and the Blood and Wine expansion.
Small key (Tough Luck)
This Small key is a key and quest item in The Witcher 3: Wild Hunt, needed to open the chest for the treasure hunt quest Tough Luck.
It can be found on the woman's body at the hidden treasure maker southeast of Devil's Pit and northwest of Marauders' Bridge (closer to and directly north of where Caravan Attack takes place).
Associated quest
See also
Small key (The Black Widow)
This Small key is a quest item in the Blood and Wine expansion, and can found on a corpse far west of Flovive, along with Letter to Pascal Pélissier at the start of The Black Widow. It is needed to unlock a submerged chest in the Sansretour River.