SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d07a114e00d760e9cff6908d0a299dab471cee056aef68f159a9b8916a2e165' 
  AND token = '3fdCjTa+lxzYqGLjZzz0I3pBSKXm+V0oJD5fdhwY8sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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