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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91bb671e922e7ca8936802b2b89cc912d2a772a71f1914f6dcea01ee09a331ad' 
  AND token = '6NWhMQXcjRC1V9yIz8b9yOzKc7Qp4iQ0XYOsSRKP2J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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