SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1846062595df6768a8c1087522ac1dca35e01adf87c9b3bae259096dc44dc110' 
  AND token = 'Kjr4DZgrs/Z5b9RL0g1lVgH7b0WL9SdzoB2qmhA3V4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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