SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e454f3dc2aa10b63189c13b2076a0cb8930462bf0800fa762694dcf6bd52df5' 
  AND token = 'zKR27B5HwK5yvCR1iT0l2/hQp4vqFx+ngqsyWwpEyyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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