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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55038d5ac51eddbba2afd74b8fe68ca07434997df5f7bf8853bb02649301cd4c' 
  AND token = '0flD5/TeLagvIkCOetkbHJ+821L11ZFikP+h4ilVfFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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