SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eef43100b5a3c73d9cd76ac27870042b5a3366470628903cae6c4e08f684910' 
  AND token = '+fCgQrKV+vP+DvSGWkxAhXQLBgiY9LwQfAMJM9kwuGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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