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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c3b7ae0f390e37370ae1b023967991b0726c6a682360b32338caa02aee9a073' 
  AND token = 'hpHnTKVj1OGd2ZoaGlqJJT0lBqF0HogsXKEdG/vKiuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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