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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbad6478bcf7d83eae517affa43b8dda7e14f50952d163a8826d1d739fd1d5a0' 
  AND token = 'btk5NZh/2n8iOM5coCvizDiEbbLiDo6OZ5eQriyaEsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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