Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8c2e5261f6729eec16350fefe03f7c43dbaf0fdc53aee1d59b1483df0c2698d' 
  AND token = 'crL4T/fYaB/GQCpHUYak1jguw6wwy5hu4eZm6ih6tMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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