SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237da02392786e6d385a2740eb70b7c402dc0c7df1575135b2e79394611951cf' 
  AND token = 'HbcAZjfDrHPvTYqrGLlR/QH7yqD8hM4zWT+qQ0+tt68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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