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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdae20ca0a4f9c7b8633b938c6df44ba798588a23611351dfcef2b82758ea76e' 
  AND token = 'sLMd3N0EASRtz5FHgpsLyn4peDnoBQovWjMAjlsIKGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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