SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92067ac67911b710b39c421423bcbab489859a552db2a3b36d598b796d64bd16' 
  AND token = 'suOVsmazqOASQ5lcVMkxg0Duvyn+4dWL4fgQI/PhJAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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