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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '588492b751bbd77317d7b4fd64048da8c3c4f6f1ddf52b8a81ed2249a2f2576d' 
  AND token = 'HVe0SN5j1zhy2iXn/mkWyanhAevtjIU7JsaN5A0QrF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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