Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '240281507e2a77a6be56b9f547ab4fe9ce2cb09bf71965af4b03bea5c734e749' 
  AND token = 'vwis/cLjHuTWhZM/T1/jC+XFeke4RdvMZyxVmUgTvjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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