SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12b399c17c9e5ec2f3b02e4db57645fe9cd9422fb5f8916201f485e617a16001' 
  AND token = 'XG5g+GVPVj/ohiH3pXvz64pG78ILqiCI0nTy6/MVuO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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