SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6bac7a70a85bb20c0964ec4891db5f7ad210b88a5e3c58d553711246a5f1961' 
  AND token = 'JMHZi6gfi9QqnG0oJd3auSMjxLqc5/xVr/E7LLzIJOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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