Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3430178376dd1cf57cc56bfdc95acec7df8079aa162453677d57240d6a9bafcf' 
  AND token = 'S/XpCHuc//iqqTkMMLkccvy8m9JihhXygPRsVEMgx80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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