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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bae679eda69f189af29ab06b5884d28a35ae7e2864b71f53ca918d4ec948969' 
  AND token = 'w5PehcKomyMyVNC1MdUSV8p2KfhMh2NHd1djbBtjrZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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