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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12cda31ab4ec75bafb496ab37e08726b7fa9a1b93c0befab4d08f8e004d59cc9' 
  AND token = '6Dxutuo5n5fWCMINANYP7lG6up+RpXvMT0VILWqj0q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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