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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fd32f410d3fc9d4c06c8f4a55b52cb5bc9850a17167dcbbf985a91bbacd011d' 
  AND token = '+FkxStuTszQcz4xNUDYpLNi1RcYUZIC2m1AGhkroJNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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