SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcf2a262d8b023c1d01887cb5e7ba5d24cf00a579b3586844c262902c5d57c10' 
  AND token = '6gR9s87piZMhhXHabvNhzFt6kd/vmbFvVO4zwk81zD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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