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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddbbab7704e32fc917bbf54978677f63e4ecd967ad7557679caf783b6c28b7dd' 
  AND token = '+9djSJwvbmUcloq1hsl9GUiTsC6scyw/c5zXVfDpGHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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