SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd023928ec2054363a2ca454d325558ac246c488b53f6001260b2847e455c698a' 
  AND token = 'UUpqWifVx+gDaGRX/8iCeWfzPSCRz6rGBfLMgEy9S7Y=' 
  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