SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f61a745b72892793cdb56dfcac8c619511930fcb7e8133e96f421eb1a1e118e' 
  AND token = 'ZTp89vVIGh2O6ZFm8d2+kKQsUXkiogBvzM1/9W8PwHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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