SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5baa15f91f4de67c3c24ec80373097c75f487bd6fc76cdf237c9fedc6661314b' 
  AND token = 'JoBQnzjFzp8j2H7oKv3UxQ62TJvLKN4rQ8+uOAtY+10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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