SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cad9dbe79baed854cded08b9abdf3caef118372b33ea2a91a8db73489188e096' 
  AND token = 'cIYar/W3t+JsiIzUHtRCFT5pb8UlJR95hMZtM4U93nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables