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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '154e345af967f983ca181ffb9fd8326d8b7d4e0f0dc8343ac337dc8cc94e8742' 
  AND token = 'vKERN/MULN7PPpC+jNvXb/PcZWjnXsIMy3W8Oduiuqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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