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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a9614cb647d0f87c3b0afe175b4e26ddb84b79fa9e3ec9c8b31b2619340a2d' 
  AND token = 'DKKeAGPXn+9JlnrJd5oG9p4WhUVTMN7hBJpitFd2g14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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