SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac2e0cbf7c3fc66ed062b205c1f9c4ce5c5e72a75ac32684323f19a44209635' 
  AND token = 'vzY6zPxI3/exVNPDZZQG+jzewWVSLmrUV8xIEBrqsOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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