SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cd6fb735880e2962f6f5192f336ef0d4cf61525048c7407fd520b10f4298170' 
  AND token = 'EZ+l1YdAB09vKx0FzkGhYrfe/YLyVGHaqqfrhTOhawU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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