SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c64967ad263fe96c27827ae624d1a19d320fe36f59ed234a54fbdd4f62adfb' 
  AND token = 'IV3lljcjKhIS0NYvhX+YmXKlzwq3XekOjgC/0s1R7b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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