SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3e7976ce5f5bbeac8622ea652675c03741b7df0f8e84044b7bcdd48f53cbf7' 
  AND token = 'VzwKghdY4sqVZBKa2S/wlodf2ggRg9FJqEaTkmuBhFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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