SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a92f58bc3fa794e13f1b3ec6c8b6e82f871c25f79b9c7d7cb98774f923ae79d6' 
  AND token = 'nN+Qlhq3jJZ3tRjh+AGMBEv0eTPO1op7vxvAK4PfW1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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