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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79adf933b9e851a6dbf096db79fe69528ccb34545090939f8cbc17a14187be02' 
  AND token = 'Xyos8hgl1ycKZZIYEY+mTDAe7bkZL7x9EhWDcDBlNBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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