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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '436c78a72167d5b57ae480e7feb6d9b51fb9f6136f3ffb83cddfec4cd1d9e327' 
  AND token = 'ICSSZ7oJo6Y8SJCRvPNZaXWlZyPHd8RUhsRjLqzevEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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