SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f62522eeadd97806ef136d86e79f451aaf9f7db184e2d03321180c56c9067e7' 
  AND token = 'wEB/VNL7H7e3sZVpC87SO/4q5qxKVKAms7YA9ZghG1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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