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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab8316650052571dce3b714720b4b25aeb088956bbefaf7e8e396c62f0078e4' 
  AND token = '0OvA7AbAn7KBbVPDKnW5MhSyhTm4FaPlhT1qWyTte+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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