SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fa5ae3f3d6a2eb00339cb5f2ab21b58cb46383eb24855f34ad0e604db17f55b' 
  AND token = 'hBmLzvYXQ0pXilhl9ZCQPAqXcwW32pQGogdxYLX2hm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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