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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0bfcd45b19ba42c7b91acf149976f779c017e843ae940ae0a53367c77a91376' 
  AND token = 'tjbICQvyCcMBUNMbY7DQeZ+m9WbHVNQo5Hgst0nHoTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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