SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80c4b0a329b134cc83f8e3466d8cb56ac76dbc9efec5c2f02424e001a379f3f2' 
  AND token = 'kM1BKswGtF24hXY6aDv6JsP9Kmf+R+NBeJRG5pVDJAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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