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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15f58fd0eb1635774e9cfeaf8343c7fa9026eb00ce2407dee9d49bd2eb594ae3' 
  AND token = 'SyiKXxTUWaJUk8jlB9r9YnmjE77V8+/+UGMw5JX9bUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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