SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dede99ca7e6565f1ce99182ae8f3f7d33c7b9e30b7316586f56c90d0042ff51d' 
  AND token = 'XxSRr3REy84wdCGPKr90J/+l8KfRvcGJmWq/gvapxFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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