SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01293a82771bac76b0bd13b9f342f2851b592bf4d537bf9ef259f2f359950654' 
  AND token = 'B1zxGV4kUckR+smCmNJVUfg6dXQqweZBbja9dhwKp5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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