SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e39657ea82686145612214edda73405d11a85f361c96423e440ccb9206fb85be' 
  AND token = 'BPzDxV7TwGGpvQWSbEf1Xbe9oLzgjrIjhBKbv5jaN0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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