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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bbfd6bd4938a4122a79b3cc1fbf97df022a6794b373d8af29550912b31acb20' 
  AND token = 'fXH3JZYnRzYdw2Mx9ZNHf9QW17qstl5MOLn99zD/wXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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