SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45aaed3cb32357b8d2f83e942b74abcd05b5289d17c79a19056ed06c2a1dc85f' 
  AND token = 'S+S+9HngwjXQuBwX+oQUcLxoiPUWRfMb0k/GgCrmhmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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