Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be081ae55e17c1df0cafd40da0a300948e9fbeba08f4ad242374d9b2765f6ddc' 
  AND token = 'xPGO3jJ7sMfwjPyyzZj2enZU/EhqO6MCjfwJ7rmL21c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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