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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ec7be678aac82da6f946cae2cd8c51ef9085bcb705ceea851298384dbecb14' 
  AND token = 'LjMX8pYz9Zf9lE7PaFg8RkwEWt0WONU0L77X6ddl8iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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