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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0c7104195c0a1b41a72b8b5e16a9d6079271b66e2b4eb2113b64ae7b7eccc52' 
  AND token = 'FJP+BP6IWLG0bCRnEgx4UkW9mteOjLxfnZu3DCRzm84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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