SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '088812c093fa307e4f3be657a20c6eb0f2162c154d8cdf0fd7c6697ebd591b1c' 
  AND token = 'QBYVfpsKhoaJjCYvyo/zPBJanFyb06yGZXVnqvF5bzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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