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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '269e021cc74787a7a8a754bab682218aeb02077bba67ef87194094ccd8ced4d4' 
  AND token = 'ZB7rqhzM2UqcFbwyY6ts2ZYNQcaoSJyqH7WOvExIqwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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