SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bd3ad78352e5d58538fe6f809e94811c8024afd8a5d3f5b9b5cbf64cd464189' 
  AND token = 'urpOEbbiiKvy7UfurVGbVJAO+ATgn2+vwy3WhqJ3nuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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