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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ed56adb6700ae72e314713c59e16984b90d39b6a089f5bb6c4d97f5b5fcd5fc' 
  AND token = 'ts39WDM8x30RZ5hd8JfmlOVZ0Tb6MpLIZo0CqKx0T+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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