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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999413a081ade82dfb40f6e750d4df9b2dba41f85f1303c19ae2ec953d781eca' 
  AND token = '2ooc3FSoBQJu/1A+l9WSj39ym8EblCM5mHfuVpqAaws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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