SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5507f7f7817d509a881a461b4919fcd09e7f56f9c241770f2e32b74a429a2126' 
  AND token = 'pIRPlREZTT5co+iYRXvjtumVhh5iKWNjHx9FJ2zfzfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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