SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00245a49906b2163be19d61ed13b57fc6b64d0669000c1ae79a50698fb002088' 
  AND token = 'B1NGcADbSLpi4wvljqUdIzFnvhjXsj5aWzxBZgsR++k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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