Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8a6b0ef5921cd7c616dd33b33f7772bf694e6779fc6610a61784dae25440857' 
  AND token = 'N2mDLcQ31magirlH0BB71myQzRbaVJ3LK8JqLAfeExA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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