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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9440bf5a33f219430288af914f923c9a4bae67a8e9b305355b251b221b192653' 
  AND token = 'qINgqo71AlvM0qncE7hWi1o2pf+ViJvARrIO6jq3/uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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