SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '010458cb6b9a52e16a92f1d7cd97d31be3b54fb431851d3e43bffde78897008d' 
  AND token = 'oYwARCTPuHTMFkTLxmAMV2HevWsdq6e/HnghnFGYQnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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