SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb04fa95b164d8d6d0cba95086d097138ff4c4a8e61cc12332094ac7da4f7bf' 
  AND token = 'haslBrEkqTLbHjFkIZ5iuJSoVpuLBi3/WgQ+1Cddn4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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