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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1134676c3dd2f0ebf9f149c8fe5c32704f9f1670613ad3d9464a70ecda60b6ec' 
  AND token = 'qBSvsUB5P9jgYmqd6csY1vtlL72ak1dHNz9D5rexwHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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