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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b12cd978b47049679daadf402b24b5ae4ea2c68b2805248a0cc952fdbf5c19' 
  AND token = '0Wy8jdZ1TH96NNbUiHlsHpcY/+cOViv1qn9kI1pLxGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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