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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb5710a56529db1cfdb7c663c58352eefbd8d3cbab3a6534bb8f72a4cc1bc95d' 
  AND token = 'j4UHxxjv1qZ47F9qtQrdltSOgLyBNeSSouANnhnP120=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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