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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b6bf8c527eddea5ad2d6ecc2687eaea3af1f01527d07861976cc2e400433f8' 
  AND token = '0TKCklR0G3bDqKVmLqoukSTtG5yT5Mq5akoGVojjgnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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