Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db71007caf78029c541047b7bd0ecda5d91d87d11daa4c74a2b829d0b6a89c3a' 
  AND token = '5a+jk6rzsVPTi+Y/XXNIXZc9WKtixj+vwBgsRvJtcwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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