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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac91899ea658bb774115474ac8f484734f4a215407990ec41a5f09a50a15cd48' 
  AND token = 'hp13/+eaYBE4QYV9eoobkYNXdc56XG2+uJA5uw6v9ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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