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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32431cb1edc1bffeb4de0d480f88dcd1fcf99237f24b6e0c7eee5a056c24fb8a' 
  AND token = 'kC0K+YW/FcJ1PEQSsRL9OBNHZw4xI742yGbKpQ68JsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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