Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace222c1419cdc725589a85f78ea4e49ec4cf6f0c63693a35371fa560bc3c52f' 
  AND token = 'JhK2PIRFHEJKfIZQ9CD6Z6iKsziQuLwEr9Uj4e7iOeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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