SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b7a69b9b1899407f4dfde10ffbf502c322d28747c847ac7868361383830a956' 
  AND token = 'l40gS0UEzuOrqaR/PVKotwlmFuPDItNhYKpR9o4xdtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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