Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb4e9cf126f74ff14d3002598771b4a653767bb424deeb69f9aafa2021953b4' 
  AND token = 's9nOsf4K0FVilekN19TmWiDTI1xdcIAun6WxPaasmO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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