SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78b8ee97279c86e61df791061f4d15d652c320bc5ef9fd28789c41a129f7f1a2' 
  AND token = '5Mq1jQYuksiZFJUm5BMMIgKnnDV3B4N7/ubtpI9o5uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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