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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '859db92d15274d7e3bab7562ec75c08185441c1d66b0837cb768abd9216df8d7' 
  AND token = '9iPkub8uAtsd+86MmopBP1+ZsQRFJus0hzKkW3saZYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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