SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b50b9f3b23b3cf923ae027407ef419658dfb7a4e370104add316895e6a8ce172' 
  AND token = 'CzzlKczKXStCa5L/1ziCBqqrUh3fCWuEF/AW44JsVZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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