SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a97b96a87505d303f681790fc94fd52d6f73747f591a20f0bc1d2fb667d26ee' 
  AND token = 'Vwxav7GplfVFJBLPoSkDediYerHTFmqmteUKHJyn4vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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