SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85cd3b137d333aa4d233f098db7511e94b8f47047c7ba9ad08626548a844f885' 
  AND token = 'pSjndJkTzzmPqYxlvMC/s0GevZQRFF4FSjByNLyNoIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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