SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1364318438f9932159a630b99d1e5da4cb1c5722c6ae5ddd6af4216ed83bf03a' 
  AND token = 'bFd50hvZjM2cwphQgQL6wXF0U/R6+fGbBY1yOIpsU8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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