SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a57b97c63d8983b2bebca0d224925292e5cc1f04457cf7b297416123004e683' 
  AND token = 'cJNJFAhrBGIQz3pLZZO/VYIRf3ysHiWUMLqEL8BezDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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