SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16f102e1d0a90f9c6da5eb6b4388e8fa46c925bd2c8020ca93b83cb8437fc243' 
  AND token = 'iuB0BM2ozQVdoqJZ6FQ3SvGT4esPaLQIiEplhzH7IpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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