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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6464298a59bb4a3396a7d20190f1f2c9ab097aa8071176bc5cca38f6d1ade5' 
  AND token = 'sUB3MYWXHa9c6sst1Y0RcOaaDBGUxHHffZF269NHmrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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