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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f4ebd8530cf087d14ceb76209fc7397f0f9f5c8ae543dd5f6b471b56e53efa8' 
  AND token = 'aeHkR9zsEz27qBSd2WzV66ftde6XIMCTWJx0oh6vIYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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