Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c3e91b8a5abc561e266774a2db704eaf69e8bb8a0b4d188da0456aa3a3db7c' 
  AND token = 'doUEmFyGQOwCWqMPFsyVDDoDsn0ie2qExyg/KjYslE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}