SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66323ac8143f84e611aa2cc3de59a7b9825400f08309c4de8a2f12d7ec6741dd' 
  AND token = 'jJ+8sxpHyoVeH0uPfbaKyHfpt0MdaDbVRBBwjoeRLn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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