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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f893f3b5863293228d8cae7fd613ddb14793929ee5c76623ffdaa1a50e14f235' 
  AND token = 'JHtAWu1BldOk+IjVqobaEXvX6KFdNC5e6KysMyapN4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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