SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8444ab953e7b9330735b2b57e5a6a62e1578bd012f45e8ca5665c4b226554df7' 
  AND token = 'xlYBgYGFdIqT9KwzGA13mPb5KBISCPOVg5IhXrEKH9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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