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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b83f9fb09da98906fd3fe56a012a150d19eef3be8f72a8b87a8f765a8f9ca08e' 
  AND token = 'SLESRt3wUhSXpaWIicnr/z6zQneuQg1xTLaiuwMJZdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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