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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26c446c7b19a663e39f19454ae448e8bfb9ce41449cddef42e93f049ffbe3a8d' 
  AND token = 'Sidw1HV7O4p6PnDm1FRYmHBv3QYg3gLgbUpbwywi4Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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