SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd05b539f102226af9270a2e78e259e374295b474c59a187b47b1db65d8b48344' 
  AND token = '1nSzIGhB18LjRouL8Cyntegm/4SUYhcUwdUDZcPrVNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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