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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a9e9554dd29bea27e8ead01d50a9febee1f879141a09d29ecf0bf92efc8938' 
  AND token = 'oxccLDPs0YFjVJLy6qRoo0o/55IlW/DGer9yHax0eXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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