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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef1db55478673341a83ad43f41a8f16011ec659f4ab6081d440c7f413fb3e47f' 
  AND token = '7TOe+jFpbOnZvTEixBvgdwVFKINu7JMmqCKdGTAuOa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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