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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3efcb109c16cfd458ed704bb0aab2fd4c0a61f76f8b8995f86cd9b917885345' 
  AND token = 'Mgp26LkYoArcNT86QOMVe7LSWPen+68jfTxv69Fn5DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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