SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '528e5ddb832c9099de5e366f547dd57e2cb2fed964dd186d6f13110db4c3cdba' 
  AND token = 'VYBHbohjDXzcnUW+AVl6m2Aa5rvd/VD9FHZRLrfqCZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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