SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc2fb695ac318acf76930784d3f9d0dc94db1a568d61084b4acc3bc2faf152b' 
  AND token = 'ZcxkfZuCoX2yk+kr1vBShbwhVoPiptKn/XXJHzxdIGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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