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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cb59f26d47b967dd881648540d35a4e94ac9fd50821667f6f78d1f73e5458ea' 
  AND token = 'qml7iHpwOUxGr9BJ1eSj7vHbtpki5GY1xdePB8jmHjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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