SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72dba6c2e4ad2090a5b3d9f6dcb68bcdfd3b966a53fe97fc9fe27a27978051c2' 
  AND token = 'XkHrpFQ/vqojD5K6dwgVjK2n3pZvbedwuS++Q9PPZU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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