SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f066e04ab8571274ee8e9dda8f5aefc8366932c20e0bfc439a7ee774f40e254' 
  AND token = 'I99xLXGC/YC1JTqcbVJP83qFAVpY/hmxGJqBh5mEo4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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