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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4d2ffd52e820ad68c081d2fffb3fef8fd2f0ef8b6697b56fbb2ab3cb65d76d5' 
  AND token = 'DxI6ZLyXs/6K8o8EXmhfMGliC4jpclYBHdf99GIhloE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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