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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a446ae3ef075091100084795c5167b89b7367ea89d5db1e3d971bda47ec28978' 
  AND token = 'QUUafr6PRuKHKQLX6N07ApyyTzyvGzPO0vG8l1xKmYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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