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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e94f7ea3b6ec71c9dcbd2753cf90cd135f370119ec12024b5e5cea0cd85743e7' 
  AND token = 'yZ8FDn7g5YhMFcUwWENB1OZY3Drv/Jsq7CRYVoVmYfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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