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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acda234ee9ac31714f9201cb27ef93c4d541bcaf9f4ad67897dd099865c329c2' 
  AND token = 'WKsVJGetojXrxk4kKXDnml9SmbZvPhmxJcWy7iMCh2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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