SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7d23db804391301db9c5bab6bd3c710b467d5747027e5c4da6bd168f80f8963' 
  AND token = '95kJg0WB6NlPzh9QkHVJBlIXiIw/+EnHyNMNUzT43gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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