Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8b52333d3ccffbbff5bb415d11acecb8285107e0d671abacdcc4980bf2437ab' 
  AND token = '2T1Qj00qJOSZk1PkucfeiJYMZPgppskPPOs1cKRWY8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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