SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '126f8668d2b33f9f0a1adc124a743c5f81e857936b3a512c84bbfab10cf6ca1f' 
  AND token = 'BXJJN6/4bzznKGWYGvoJNOVLDUancZaNvKjBSVuor4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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