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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dba5bdb5a5b067e4099fb7fa21fa2c444df5bb46ea5c8197f8d8bfa4ceb5800d' 
  AND token = 'lSWFnf+rmhj8zQKOIUWZawB1/xV8Vwuz9WBmamZ2F5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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