SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c2f24cdffaaa9eef3dbeb534cf3ea3c6cb4dc21d8392c41e518f63105e89321' 
  AND token = 'J6Ey2XKef+M6E9eTBBs71mmanL8IjANtDv1TmaFbQPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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